Co-reporter:Ning Li;Tian Lv;Yao Yao;Huili Li;Kai Liu
Journal of Materials Chemistry A 2017 vol. 5(Issue 7) pp:3267-3273
Publication Date(Web):2017/02/14
DOI:10.1039/C6TA10165H
Two-dimensional layered nanomaterials, such as graphene and metal sulfides, exhibit great potential to be used as efficient electrode materials for high-performance energy storage devices. However, it remains a great challenge to achieve highly stretchable devices based on the above mentioned nanomaterials because their layered structures are easily damaged even under very little tensile strength. In this paper, compact graphene and its composite films were fabricated by a facile pressing method and showed high flexibility and stretchability (100%). By using the compact graphene/MoS2 composites as electrodes, flexible all-solid-state supercapacitors with a volumetric capacitance of 19.44 F cm−3 (70.00 mF cm−2) were developed. These newly-developed graphene-based supercapacitors can bear a high tensile strain of 60% with slight performance degradation and can retain 87% of their original capacitance after 300 stretching cycles to 30% strain, exhibiting much higher stretchability and stability than most of the graphene-based stretchable supercapacitors reported previously. These compact graphene-based materials may prove to be a promising candidate to be used as electrodes for other stretchable electronics.
Co-reporter:Huili Li;Tian Lv;Ning Li;Yao Yao;Kai Liu
Nanoscale (2009-Present) 2017 vol. 9(Issue 46) pp:18474-18481
Publication Date(Web):2017/11/30
DOI:10.1039/C7NR07424G
Hydrogels with high ionic conductivity consisting of a cross-linked polymer network swollen in water are very promising to be used as an electrolyte for all-solid-state supercapacitors. However, there are rather few flexible supercapacitors using ionic conducting hydrogel electrolytes reported to date. In this work, highly flexible and ionic conducting polyacrylamide hydrogels were synthesized through a simple approach. On using the ionic hydrogels as the electrolyte, the resulting supercapacitors not only exhibited a high specific capacitance but also showed a long self-discharge time (over 10 hours to the half of original open-circuit voltage) and a low leakage current. These newly-developed all-solid-state supercapacitors can be bent, knot, and kneaded for 5000 cycles without performance decay, suggesting excellent flexibility and mechanical stability. These all-solid-state supercapacitors can also be easily tailored into strip-like supercapacitors without a short circuit, which provides an efficient approach to fabricate wearable energy storage devices.
Co-reporter:Tian Lv, Yao Yao, Ning Li, Tao Chen
Nano Today 2016 Volume 11(Issue 5) pp:644-660
Publication Date(Web):October 2016
DOI:10.1016/j.nantod.2016.08.010
•Fabrication and properties of aligned carbon nanotube-based fiber were summarized.•Advances of wearable energy conversion and storage devices based on aligned carbon nanotube-based fibers were reviewed, such as fiber-shaped solar cells, light emitting diode, supercapacitors and ion batteries.•Challenges and outlook on the wearable energy devices were discussed.With the rapid development of wearable electronics, it is urgent to develop flexible, lightweight and high-performance wearable energy conversion and storage devices (typically in a fiber-shaped format) to be used as power supplies. Due to their unique structure, fiber-shaped energy devices that can be easily woven or integrated into clothes, bags and other textiles have been widely investigated in the last ten years. In fiber-shaped energy devices, fiber electrodes have a significantly effect on the performance of the resultant devices. Compared with conventional fiber electrodes, such as metal wire and conducting material coated plastic fibers, aligned carbon nanotube (CNTs) fibers or aligned CNT film wrapped plastic fibers showed higher flexibility and stability, which have been widely used as highly efficient electrodes in fiber-shaped energy devices. So far, various fiber-shaped energy conversion devices (such as solar cells and light emitting diodes) and energy storage devices (e.g., supercapacitors and batteries) have been developed, and great achievements have been received. In this review, we will summarize recent advances on the aligned CNTs-based fiber-shaped energy devices ranging from energy conversion to storage and self-powering devices, following by discussing their opportunities and challenges for practical applications in the future.
Co-reporter:Dr. Tian Lv;Yao Yao;Ning Li ; Tao Chen
Angewandte Chemie International Edition 2016 Volume 55( Issue 32) pp:9191-9195
Publication Date(Web):
DOI:10.1002/anie.201603356
Abstract
Stretchable supercapacitors that can sustain their performance under unpredictable tensile force are important elements for practical applications of various portable and wearable electronics. However, the stretchability of most reported supercapacitors was often lower than 100 % because of the limitation of the electrodes used. Herein we developed all-solid-state supercapacitors with a stretchability as high as 240 % by using aligned carbon nanotube composites with compact structure as electrodes. By combined with pseudocapacitive molybdenum disulfide nanosheets, the newly developed supercapacitor showed a specific capacitance of 13.16 F cm−3, and also showed excellent cycling retention (98 %) after 10 000 charge–discharge cycles. This work also presents a general and effective approach in developing high-performance electrodes for flexible and stretchable electronics.
Co-reporter:Dr. Tian Lv;Yao Yao;Ning Li ; Tao Chen
Angewandte Chemie 2016 Volume 128( Issue 32) pp:9337-9341
Publication Date(Web):
DOI:10.1002/ange.201603356
Abstract
Stretchable supercapacitors that can sustain their performance under unpredictable tensile force are important elements for practical applications of various portable and wearable electronics. However, the stretchability of most reported supercapacitors was often lower than 100 % because of the limitation of the electrodes used. Herein we developed all-solid-state supercapacitors with a stretchability as high as 240 % by using aligned carbon nanotube composites with compact structure as electrodes. By combined with pseudocapacitive molybdenum disulfide nanosheets, the newly developed supercapacitor showed a specific capacitance of 13.16 F cm−3, and also showed excellent cycling retention (98 %) after 10 000 charge–discharge cycles. This work also presents a general and effective approach in developing high-performance electrodes for flexible and stretchable electronics.
Co-reporter:Ning Li, Tian Lv, Yao Yao, Huili Li, Kai Liu and Tao Chen
Journal of Materials Chemistry A 2017 - vol. 5(Issue 7) pp:NaN3273-3273
Publication Date(Web):2017/02/02
DOI:10.1039/C6TA10165H
Two-dimensional layered nanomaterials, such as graphene and metal sulfides, exhibit great potential to be used as efficient electrode materials for high-performance energy storage devices. However, it remains a great challenge to achieve highly stretchable devices based on the above mentioned nanomaterials because their layered structures are easily damaged even under very little tensile strength. In this paper, compact graphene and its composite films were fabricated by a facile pressing method and showed high flexibility and stretchability (100%). By using the compact graphene/MoS2 composites as electrodes, flexible all-solid-state supercapacitors with a volumetric capacitance of 19.44 F cm−3 (70.00 mF cm−2) were developed. These newly-developed graphene-based supercapacitors can bear a high tensile strain of 60% with slight performance degradation and can retain 87% of their original capacitance after 300 stretching cycles to 30% strain, exhibiting much higher stretchability and stability than most of the graphene-based stretchable supercapacitors reported previously. These compact graphene-based materials may prove to be a promising candidate to be used as electrodes for other stretchable electronics.
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